Manual de Plantas de Costa Rica 251 
cuspidata, P. izabalensis, Psychotria zeval- 
losii, Tapura guianensis, and Websteria con- 
fervoides. New species from this region de- 
scribed recently include Calathea gloriana*, 
C. hammelii*, Chorigyne pendula, Chryso- 
chlamys sylvicola, Dichaea sarapiquinsis*, 
Dryadella odontostele, Eugenia sarapiquen- 
sis*, Licaria sarapiquensis*, Moutabea gen- 
tryi, Palmorchis sordida*, Persea silvatica*, 
Pouteria silvestris*, Psychotria laselvensis*, 
Scaphyglottis atwoodii*, and Stelis ham- 
melii*. 
A systematic study of the Llanuras de 
Tortuguero and Santa Clara would surely 
reveal many instances of their phytogeo- 
graphic relation to the Atlantic lowlands of 
Panama and South America. A few of the re- 
cent discoveries that testify to this are Amanoa guianensis, Dioscorea davidsei, Guatte- 
ria alata, Hirtella racemosa var. racemosa, Inga ciliata, Ludwigia helminthorrhiza, 
Ipomoea eremnobrocha 
Micranthemum pilosum, and Sipanea biflora; and among the new species: Anthurium 
limonense*, Bactris polystachya*, Licania belloi*, L. stevensii*, Hirtella trichotoma*, 
Macrolobium herrerae, and Unonopsis stevensii. 
We have relatively little data for Baja Talamanca and the lower Caribbean slope of 
the Cordillera de Talamanca, owing partly to the difficulties in obtaining permission to 
work on Indian reservations. Nevertheless, the few incursions that have been made 
yielded significant new records, such as Abarema barbouriana, Agouticarpa williamsii, 
Anaxagorea panamensis, Annona volubilis, Anthurium cucullispathum, A. hornitense, 
Aspidosperma excelsum, Calathea allenii, Elaphoglossum denudatum, Licania mi- 
crantha, Lycopodiella steyermarkii, Metteniusa tessmanniana, Otoba acuminata, Pen- 
tagonia hirsuta, Perebea guianensis, Philodendron grayumii, P. sulcicaule, Sciado- 
cephala dressleri, and Zygia inaequalis, as well as a number of new species, including 
Dicranopygium tatica*, Herpetacanthus stenophyllus*, Licaria caribaea*, Pleu- 
rothyrium oblongum, Plinia cuspidata*, Pouteria filiformis*, Quararibea gomeziana*, 
Stromanthe palustris*, and Zygia confusa*. 
The lowlands of the dry Pacific slope at the base of the northern cordilleras, which 
we have designated the Guanacaste plains, have been more or less continuously ex- 
plored, especially in the basin of the Rio Tempisque and the plateau and surroundings 
of Santa Rosa National Park. In spite of the predominance here of dry forest, relatively 
low in diversity, many new records have been found here over the last few years, e.g.: 
Allosidastrum interruptum, Apoplanesia paniculata, Bidens oerstediana, Caesalpinia 
platyloba, Colubrina arborescens, Croton axillaris, Diphysa carthagenensis, Echino- 
